Stereoscope



March 4, 193" H. LUSCHER 1,749,220

' STEREOSCOPE;

Filed June 26, 1925 2 Sheets-Shegt l Inl/enfor:

Hermann L 27cc}: or

W luuu Patented Mar. 4, 1930 UNITED STATES PATENT OFFlCE HERMANN L'USGHER, OF MUNICH, GERMANY, ASSIGNOR TO THE FIRM LUFTSCHIFF- IBAU ZEPPELIN GESELLSCHAFT MIT BESCHRANKTER HAFTUNG, OF FRIEDRICH- SHAFEN, BODENSEE, GERMANY STEREOSCORE Application filed June 26, 1925, Serial No. 39,646, and in Germany July 9, 1924.

My invention relates to stereoscopes and more especially to the handy and light specimen ofsuch instruments. It has always been aimed at folding a stereoscope so as to be perfectly. flat to allow for easy pacldng in the lower surface planes of the middle portion. This arrangement causes the great ad vantage of allowing the flattest possible folding state of'such instrument. When ready for use the portions carrying the glasses and supporting the picture are substantially vertical and parallel to each other and connected horizontally by the third portion at right angles to them. Whenfolded all three parts are practically in one plane, irrespective of the direction in which the parts are folded.

For certain purposes it will be advantageous to provide for folding the vertical porand possibly of light metal therebiy tions inwardly towards the middle portion, in which case the middleportion has to have apertures and anadequate shape for allowing the other portions to fit in. lhe middle portion may be one piece or it may be made up of several pieces for the purpose of adjusting the distancebetween the glasses and the picture. 4

Preferably my stereoscope is made ofmetal reducing its weight. material may be used.

Having given a general description of my invention 1' will now point out the details thereof referring to the drawings which represent examples embodying my invention.

Fig. 1 is a top view on the stereoscope when folded together, and Fig. 2 shows the corresponding side view.

But any other suitab Fig. 3 is a front view on the instrument when unfolded and ready for use; Fig. 4 showing the same in side view.

Fig. 5, giving another example, is a top view on an instrument in which the portion carrying the glasses folds outwardly from the middle portion in contradistinction to Fig. 1, where it folds inwardly.

Fig. 6 represents a stereoscope in accordance with my invention in which the middle portion is adjustable in length thereby varying the distance between the other two portions.

In the figures A designates the middle portion with its upper surface plane 1 and its lower surface plane 2, B is the portion carrying the lasses and C is the rear portion intended f or holding the pictures. The three pieces A, B and C are connected by pins 3 fittinginto corresponding eyes 4, which have the longitudinal center line or axis 5, situated between lanes 1 and 2. Piece B has a shape which a lows the nose of the beholder to project inwardly of the instrument between the glasses 6. Piece C consists merely of two arms 7 connected by a bar 8. Arms 7 having longitudinal slits (not shown) adapted to hold the stereoscopic pictures after they were introduced from above.

In Fig. 1 piece A is shaped in such a manner as to allow piece B to be folded inwardly into a corres onding opening, while in Fig. 5 piece B is olded outwardly. But in both figures A and B when folded are in one common plane, into which also arms 7 and bar 8 (together constituting piece C) fold.

In Fig. 6 the middle portion A is made up of two parts a and .b slideably fitting together by means of projecting arms 9 and corresponding slits 10, which may be moved in relation means 11.

In a similar way the distance between the two eyeglasses in portion B may be varied, which is not shown because method. and means for such-purpose are well known.

I do not want to limit myself to the details describedor shown in the drawings as mtilany variations will occur to those skilled in e art.

to each other by transporting What, I claim is:

1. A stereoscope comprising a fiat middle portion; hinges at both ends of said middle portion a glasscarrying portion hinged to 5 one on v of said middle =portion;v a, picture carrying portlon hinged to theother end of said middle portion; the axis of said hinges being situated between the upper and lower surface planes" of said middle portion; and

part of said middle portion being out out so that. its remaining shape allows for the other i two portions of being folded into a common plane with said middle portion instead of one above the other.

2; A folding stereoscope comprising a flat middle portion; a portion adapted to carry ,v the picture; vand a portion carrying the glasses; said three portions being hinged together; said middle portion being opt out 'and having apertures; said other two portions when folded fitting into said cuts and apertures of said middle portion.

3'. A folding stereoscope comprising a fiat middle portion, a portion adapted to carry the picture; and a portion carrying the glasses; said three portions being hinged together; said portion adapted to carry the picture comprising substantially two arms and a connecting piece, said arms being adapted to fold sideways of said middle portion; said middle portion being cut out so as to allow for said glass carrying portion to fold in between said middle portion; said three portions when folded together forming only one thickness of material and lying in one plane sideways of and within each-other instead of one above the other.

HERMANN LUsonER. 

